Average Weather in January in Alta Sierra California, United States
Daily high temperatures increase by 2°F, from 43°F to 45°F, rarely falling below 33°F or exceeding 55°F.
Daily low temperatures are around 25°F, rarely falling below 17°F or exceeding 33°F.
For reference, on July 27, the hottest day of the year, temperatures in Alta Sierra typically range from 53°F to 80°F, while on December 25, the coldest day of the year, they range from 24°F to 43°F.
Average High and Low Temperature in January
The figure below shows you a compact characterization of the hourly average temperatures for the quarter of the year centered on January. The horizontal axis is the day, the vertical axis is the hour of the day, and the color is the average temperature for that hour and day.
Average Hourly Temperature in January
The month of January in Alta Sierra experiences essentially constant cloud cover, with the percentage of time that the sky is overcast or mostly cloudy remaining about 45% throughout the month.
The clearest day of the month is January 26, with clear, mostly clear, or partly cloudy conditions 56% of the time.
For reference, on February 22, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 49%, while on August 9, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 91%.
Cloud Cover Categories in January
A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In Alta Sierra, the chance of a wet day over the course of January is essentially constant, remaining around 16% throughout.
For reference, the year's highest daily chance of a wet day is 20% on February 21, and its lowest chance is 0% on June 27.
Over the course of January in Alta Sierra, the chance of a day with only rain remains an essentially constant 7% throughout, the chance of a day with mixed snow and rain remains an essentially constant 6% throughout, and the chance of a day with only snow remains an essentially constant 3% throughout.
Probability of Precipitation in January
The average sliding 31-day rainfall during January in Alta Sierra is essentially constant, remaining about 1.1 inches throughout, and rarely exceeding 2.7 inches.
Average Monthly Rainfall in January
We report snowfall in liquid-equivalent terms. The actual depth of new snowfall is typically between 5 and 10 times the liquid-equivalent amount, assuming the ground is frozen. As with rainfall, we consider the liquid-equivalent snowfall accumulated over a sliding 31-day period centered around each day.
The average sliding 31-day liquid-equivalent snowfall during January in Alta Sierra is essentially constant, remaining about 0.4 inches throughout, and rarely exceeding 1.2 inches or falling to 0.0 inches.
The highest average 31-day liquid-equivalent accumulation is 0.5 inches on January 6.
Average Monthly Liquid-Equivalent Snowfall in January
Over the course of January in Alta Sierra, the length of the day is increasing. From the start to the end of the month, the length of the day increases by 38 minutes, implying an average daily increase of 1 minute, 16 seconds, and weekly increase of 8 minutes, 55 seconds.
The shortest day of the month is January 1, with 9 hours, 48 minutes of daylight and the longest day is January 31, with 10 hours, 26 minutes of daylight.
Hours of Daylight and Twilight in January
The latest sunrise of the month in Alta Sierra is 7:04 AM on January 6 and the earliest sunrise is 10 minutes earlier at 6:54 AM on January 31.
The earliest sunset is 4:51 PM on January 1 and the latest sunset is 29 minutes later at 5:20 PM on January 31.
Daylight saving time is observed in Alta Sierra during 2018, but it neither starts nor ends during January, so the entire month is in standard time.
For reference, on June 21, the longest day of the year, the Sun rises at 5:38 AM and sets 14 hours, 35 minutes later, at 8:13 PM, while on December 21, the shortest day of the year, it rises at 7:00 AM and sets 9 hours, 44 minutes later, at 4:44 PM.
Sunrise & Sunset with Twilight in January
The chance that a given day will be muggy in Alta Sierra is essentially constant during January, remaining around 0% throughout.
For reference, on July 16, the muggiest day of the year, there are muggy conditions 0% of the time, while on January 1, the least muggy day of the year, there are muggy conditions 0% of the time.
Humidity Comfort Levels in January
The average hourly wind speed in Alta Sierra is essentially constant during January, remaining within 0.1 miles per hour of 5.6 miles per hour throughout.
For reference, on May 6, the windiest day of the year, the daily average wind speed is 7.0 miles per hour, while on September 17, the calmest day of the year, the daily average wind speed is 5.1 miles per hour.
The lowest daily average wind speed during January is 5.5 miles per hour on January 10.
Average Wind Speed in January
Wind Direction in January
The growing season in Alta Sierra typically lasts for 5.0 months (152 days), from around May 13 to around October 12, rarely starting before April 19 or after June 6, and rarely ending before September 19 or after November 5.
The month of January in Alta Sierra is reliably fully outside of the growing season.
Time Spent in Various Temperature Bands and the Growing Season in January
The average accumulated growing degree days in Alta Sierra are essentially constant during January, remaining within 2°F of 2°F throughout.
Growing Degree Days in January
The average daily incident shortwave solar energy in Alta Sierra is gradually increasing during January, rising by 0.7 kWh, from 2.8 kWh to 3.5 kWh, over the course of the month.
Average Daily Incident Shortwave Solar Energy in January
For the purposes of this report, the geographical coordinates of Alta Sierra are 35.731 deg latitude, -118.554 deg longitude, and 5,699 ft elevation.
The topography within 2 miles of Alta Sierra contains large variations in elevation, with a maximum elevation change of 2,979 feet and an average elevation above sea level of 5,902 feet. Within 10 miles contains large variations in elevation (5,978 feet). Within 50 miles also contains extreme variations in elevation (12,159 feet).
The area within 2 miles of Alta Sierra is covered by trees (87%) and shrubs (13%), within 10 miles by shrubs (57%) and trees (25%), and within 50 miles by shrubs (42%) and grassland (21%).
This report illustrates the typical weather in Alta Sierra year round, based on a statistical analysis of historical hourly weather reports and model reconstructions from January 1, 1980 to December 31, 2016.
Temperature and Dew Point
There are 4 weather stations near enough to contribute to our estimation of the temperature and dew point in Alta Sierra.
For each station, the records are corrected for the elevation difference between that station and Alta Sierra according to the International Standard Atmosphere , and by the relative change present in the MERRA-2 satellite-era reanalysis between the two locations.
The estimated value at Alta Sierra is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Alta Sierra and a given station.
The stations contributing to this reconstruction are: Meadows Field (16%, 56 kilometers, southwest); Porterville Municipal Airport (16%, 57 kilometers, northwest); Tehachapi Municipal Airport (45%, 67 kilometers, south); and Ridgecrest Community Hospital Heliport (23%, 78 kilometers, east).
Time zones for aiports and weather stations are provided by AskGeo.com .